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Sheryl Sandberg is no longer a billionaire after Facebook stock fell 9% in two days, dropping share prices to their lowest point since Jan. 30. The Lean In author and Facebook COO is now worth an estimated $980 million.

Sandberg has sold about half of her Facebook holdings since the company went public two years ago. Her most recent sale was Wednesday, when she unloaded 283,000 shares for an estimated $13.6 million, after tax.

Sandberg’s remaining stake in Facebook is worth just over $630 million and still makes up the bulk of her fortune. Her share sales have left her with an estimated cash pile of $320 million. Sandberg also has options in Facebook, worth $23 million, plus two small stakes in Co. and , which she earned while serving on those companies’ boards.

When Forbes published its ranking of 1,645 billionaires around the world a month ago, Sandberg was just one of 32 self-made female billionaires on the list. Others included Spanx founder Sara Blakely, fashion designer Tory Burch and media mogul Oprah Winfrey.

Now that Sandberg is off the list, Hewlett-Packard CEO Meg Whitman is the only woman billionaire leading a technology company.

Sandberg could become a billionaire again. Before Facebook went public, she had over 38 million restricted stock units, according to SEC filings. Not all of those stock units have vested, meaning she is lined up to get more shares in the future, which could push her back into the billionaire ranks.

Sandberg’s net worth could also jump over $1 billion if Facebook shares regain their losses and hit $59.55.